80 lines
1.9 KiB
C
80 lines
1.9 KiB
C
/*
|
|
* Copyright (c) 2018 Intel Corporation.
|
|
* Copyright (c) 2022 Nordic Semiconductor ASA
|
|
*
|
|
* SPDX-License-Identifier: Apache-2.0
|
|
*/
|
|
|
|
#include <zephyr/pm/policy.h>
|
|
#include <zephyr/sys_clock.h>
|
|
#include <zephyr/pm/device.h>
|
|
|
|
extern struct pm_policy_event *next_event;
|
|
extern int32_t max_latency_cyc;
|
|
|
|
const struct pm_state_info *pm_policy_next_state(uint8_t cpu, int32_t ticks)
|
|
{
|
|
int64_t cyc = -1;
|
|
uint8_t num_cpu_states;
|
|
const struct pm_state_info *cpu_states;
|
|
|
|
#ifdef CONFIG_PM_NEED_ALL_DEVICES_IDLE
|
|
if (pm_device_is_any_busy()) {
|
|
return NULL;
|
|
}
|
|
#endif
|
|
|
|
if (ticks != K_TICKS_FOREVER) {
|
|
cyc = k_ticks_to_cyc_ceil32(ticks);
|
|
}
|
|
|
|
num_cpu_states = pm_state_cpu_get_all(cpu, &cpu_states);
|
|
|
|
if ((next_event) && (next_event->value_cyc >= 0)) {
|
|
uint32_t cyc_curr = k_cycle_get_32();
|
|
int64_t cyc_evt = next_event->value_cyc - cyc_curr;
|
|
|
|
/* event happening after cycle counter max value, pad */
|
|
if (next_event->value_cyc <= cyc_curr) {
|
|
cyc_evt += UINT32_MAX;
|
|
}
|
|
|
|
if (cyc_evt > 0) {
|
|
/* if there's no system wakeup event always wins,
|
|
* otherwise, who comes earlier wins
|
|
*/
|
|
if (cyc < 0) {
|
|
cyc = cyc_evt;
|
|
} else {
|
|
cyc = MIN(cyc, cyc_evt);
|
|
}
|
|
}
|
|
}
|
|
|
|
for (int16_t i = (int16_t)num_cpu_states - 1; i >= 0; i--) {
|
|
const struct pm_state_info *state = &cpu_states[i];
|
|
uint32_t min_residency_cyc, exit_latency_cyc;
|
|
|
|
/* check if there is a lock on state + substate */
|
|
if (pm_policy_state_lock_is_active(state->state, state->substate_id)) {
|
|
continue;
|
|
}
|
|
|
|
min_residency_cyc = k_us_to_cyc_ceil32(state->min_residency_us);
|
|
exit_latency_cyc = k_us_to_cyc_ceil32(state->exit_latency_us);
|
|
|
|
/* skip state if it brings too much latency */
|
|
if ((max_latency_cyc >= 0) &&
|
|
(exit_latency_cyc >= max_latency_cyc)) {
|
|
continue;
|
|
}
|
|
|
|
if ((cyc < 0) ||
|
|
(cyc >= (min_residency_cyc + exit_latency_cyc))) {
|
|
return state;
|
|
}
|
|
}
|
|
|
|
return NULL;
|
|
}
|